Problem: Low Engine Power Output; Problem: Exhaust Smoke Or Dark Emissions - Hyundai HDFN35T Operation And Maintenance Manual

PROBLEM: LOW ENGINE POWER OUTPUT

Possible Cause
Clogged or faulty fuel
injector
Low compression
Insufficient fuel flow
Seizure of Moving parts
Incorrect fuel injection
timing
Improper valve clearance
Fuel injection Pump wear

PROBLEM: EXHAUST SMOKE OR DARK EMISSIONS

Possible Cause
Fuel governor malfunction
Poor quality fuel
Faulty fuel injector
Incomplete fuel combustion
• Check and clean injection nozzles, being careful not to damage the orifice.
• Replace injection nozzle(s) if not working properly after cleaning.
• Check valves for leakage – grind valves to correct.
• Check for bad valves, piston wear, ring damage or wear, or liner wear. Have parts
replaced.
• Check and service fuel system
• Check for and repair leaks. Fill to correct oil level.
• Check for clogged oil filter and replace.
• Check oil pump and lubrication system.
• Check to see if engine bearing clearance is within specifications.
• Follow oil and filter service instructions to prevent future occurrences.
• Proper injection timing (crank angle before top dead center) : 18°
• Check and adjust valve clearance when the engine is cold.
HB29D1, HB36D1 : intake 0.25mm, exhaust 0.30mm
• Check the injection pump and valve assembly. Replace as required.
• Poor quality fuel or improper fuels will accelerate injection pump wear.
• Adjust to proper injection pressure
HB29D1, HB36D1 : 150~160 kgf/cm
• Contact HLB CO., LTD. for repairs.
• Drain and replace with proper fuel. DIESEL ONLY
• Clean or replace as required.
• Check injection timing, injection pump, valve adjustment and typical causes of low
compression. Make adjustment or repairs as needed.
Corrective Action
2
Corrective Action
25